Rotary kiln for burning wet cement materials, etc.



y 16, .1. s. FASTING 1,720,786

ROTARY KILN FOR BURNING WET CEMENT IATERIALS, ETC I Filed Jan. 13. 1928 4 Sheets-Sheet l A W/A V/l/m I l j INVENTOR .786 July 16, 1929. J. 5. FASTING .7

4 ROTARY KILN FOR BURNING WET CEMENT MATERIALS, ETC

Filed Jan. 13. 1928 4 Sheets-Sheet 2 IN VENT OR Wig July 16, 1 929. J. s. FASTING ROTARY KILN FOR BURNING WET CEMENT MATERIALS, ETC

Filed Jan. 15. 1928 4 Sheets-Sheet 3 HHHI I I I HHI HIHEII 9 WWW WW mm I. mm mwm 7L/JNYENT0R @M 16, 1929- J. s. FASTING 1.720.786

ROTARY KILN FOR BURNING WET CEMENT MATERIALS, ETC

Filed Jan. 13. 1928 4 Sheets-Sheet 4 Patented July UNITED STATES PATENT OFFICE J'OHAN FASTING, 01' 'VAIiBY, m3 COPENHAGEN, DENMARK, ABSIGNOB TO I. II- SMIDTH & 60.,01' NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

ROTARY KILN FOR BURNING WET CEMENT MATERIALS, ETC.

Application filed January 18, 1928, Serial no. 246,470, and in Denmark January 21, 1927 Cement slurry,

in which the cement mawithin the feeding end of the kiln.

This

method of feeding slurry has some recognized disadvantages which it has been pro.- posed to overcome by discharging the slurry through an atomizer nozzle so that the slurry may enter the kiln in a finely divided condition and so lose its water and be subjected the more quickly to the action of the combustion gases within the kiln. This method also has been found in practice to have some disadvantages and it has been the purpose of the present invention to further improve the manner of introducing the slurr into the kiln so that the disadvantages of t e old methods may be more completely overcome. In accordance with the present invention the kiln has asso ciated with it, either as a part of the kiln itself or as a part external to the kiln or communicating directly therewith, a slurry rec the slurry is del chute or in any s eiving chamber into which ivere through a pipe or uitable manner and iii the bottom of which the slurry may accumulate to some extent an d from which the slurry is discharged into the path of the combustion gases within the kiln in a finely divided condition under rapidly rotating slurry receiving will be more fully centrifugal action, by a distributor located in the chamber. The invention explained hereinafter with Fi elevation showin gure 1 is a view in longitudinal sectional so much of the feeding end of a rotary kiln with its appurtenances as is necessary to understood, the being shown as a enable the invention to be slurry receiving chamber part of the kiln structure.

Figure 2 is a detail view in section on the plane indicated by the broken line IIII of Figure 1.

Figure 3 is a detail view in section on the plane indicated b o g r l y the broken line IIIIII Figure 4 is a view similar to Figure 3, but showing a slight modification in the form of the discharging means.

F gures 5 and 6 are views, respectively, s milar to Figure 1, but showing slightly different embodiments of the invention.

F gure 7 is also a view in longitudinal sectional elevation, generally similar to Figures 1, 5 and 6, but showing the slurry receiving chamber formed independently of the kiln structure.

Figure 8 is a detail view in section on the lane indicated by the broken line VIII- III of Figure 7.

Figure 9 is a view, enerally similar to Figures 1, 5 and 6, showing still another embod ment of the invention.

. Figure 10 is a view in section on the plane indigated by the broken line XX of Figure Figure 11 is a partial, detail view on a larger scale illustrating diflerent forms of the distributing device.

In the embodiment of the invention illustrated in Figures 1, 2 and 3 the kiln 1, of which. only the upper or feeding end is shown, is projected into the kiln head 2. The slurry in this instance, is delivered through a chute 3 and is discharged, as indicated at 4, into a slurry receiving chamber 4" which is shown as a part of the kiln structure itself, being defined by an annular partition 5. A shaft 6, suitably supported in bearings outside of the kiln head and rotated at relatively high speed by an convenient means, sufficiently represented y the pulley 7, is extended into the slurry chamber 4 and bears discs 8, two of which are shown as plain discs, while the other two are shown as supporting between them wings 9, adapted to swing on pins 10 supported by the discs. This distributing device, as indicated in Figure 1, dips into the slurry which may. be'permitted to accumulate somewhat in the bottom of the rotating slurry chamber and takes up the slurry which, under the influence of centrifugal action, is thrown ofi in a finely divided condition into the path of the combustion gases, as indicated in Figures 2 and 3. The contact surface between the slurry and the com- -bustion gases isthus made very large and the slurry is brought into contact with practically all of the combustion gases and is thereby caused to lose its water and to be subjected very quickly to the action of the combustion gases.

In the embodiment of the invention shown in Figures 1, 2 and 3,-the discs-8 are assumed to be-lixed on the shaft 6 so as to rotate therewith, but, as shown in Figure 4 the distributing discs 8 might be annular and disposed loosely on a sleeve 11 secured to the shaft 6.

In the embodiment of the invention shown in Figure 5 the slurry chamber 1 is also formed as a portion of the kiln structure, but is shown as of larger diameter and as provided with radial vanes 12 and inclined vanes or scoops 13 by which such portion of the partly dried slurry as may accumulate at the bottom of the slurry chamber, near its discharge end, is taken up in the rotation of the slurry chamber with the kiln and is discharged into the drying or burning zone of the kiln. In other respects the construction is the same as already described with reference to Figure 1 except that the shaft 6 is shown as parallel with the axis of the kiln.

In the embodiment of the invention shown in Figure 6 the slurry chamber 1 is also formed as part of the kiln structure, but is frusto-conical in shape while the shaft 6 is not only pitched at such an angle as to throw the slurry toward or partly within the kiln, but is hollow and provided near the discs 8 with discharge openings 14 through which the semi-liquid slurry, received from. the chute 3, is discharged into the slurry chamber.

In the embodiment of the invention shown in Figures 7 and 8 the slurry chamber 1 is not only segmental in cross-section but does not rotate with the kiln structure 1, being mounted independently thereof on a fixed support. The kiln structure is formed at its end withan annular flange l6 and the slurry chamber 1 is formed with a flange 15 which is projected slightly into the kiln 1. In this instance the slurry is discharged through a funnel 17 upon the inclined rear wall 17 of the slurry chamber, which is provided with a flue 18 to conduct combustion gases to'the usual stack. The shaft 6 in this instance is provided with discs 8 as before, and is also provided with a helix 19 which serves not only to distribute the slurry as before but to feed the partially dried slurry forward into the kiln.

In the embodiment of the invention shown in Figure 9 the slurry chamber 1 is arranged to rotate with the kiln structure 1 but is separated from the extended wall 20 of the kiln structure by an annular space 21. The kiln head 2 is formed with a flange 22 to project slightly Within the kiln through the annular end wall 23 and is also formed with an inclined bottom 24 from which such dried slurry as may settle thereon out of the combustion gases on the way to the stack is returned to to the kiln to be fed through the annular space 21 and so returned to the drying or burning zone of the kiln without passing through the slurry chamber 1. The slurry is delivered through the chute 3 directly within the slurry chamber as indicated at 4. As indicated in Figure 10, two shafts 6 with their discs 8 might be arranged side by side and each shaft .6 might be provided at its extremity with a discs, as shown in the several figures of the drawings already referred to, or that one or another or all of the discs might be variously shaped as shown in Figure 11 in which the disc 8 has its edge bent slightly toward the burning zone of the kiln, the disc 8 has its peripheral portion waived or corrugated, the disc 8 is formed in its peripheral portion with holes 25 and the disc 8 is provided on the side next the burning zone'with vanes 26.

It will also be understood that various other changes might be made to suit different conditions of use, different degrees of consistency of the slurry, etc., and that, except as pointed out in the accompanying claims, the invention is not restricted to any particular con struction shown and described herein.

I claim as my invention:

1. The combination of a rotary kiln, a slurry chamber in communication therewith, means to deliver the slurry to said chamber, a rotary distributing device in the slurry chamber to dip into the slurry therein, and means to rotate the said device at relatively high speed to discharge the slurry into the chamber in afinely divided condition under the influence of centrifugal action.

2. The combination of a rotary kiln, a slurry chamber in communication therewith, means to deliver the slurry to said chamber, a shaft provided with discs to dip into the slurry in said chamber, and means to rotate said shaft at relatively high speed to dis charge the slurry from said'discs in a finely divided condition into the burning zone of the chamber under the influence of centrifugal action.

3. The combination of a rotary kiln, a slurry chamber formed to rotate therewith, means to deliver the slurry to said chamber, a rotary distributing device in the slurry chamber to dip into the slurry therein, and means to rotate the said device at relatively high speed to discharge the slurry into the kiln in a finely divided condition under the influence of centrifugal action. 7

4. The combination of a rotary kiln, a slurry chamber arranged to rotate with the having a sloping bottom to deliver to the space between the slurry chamber and the ex-wall of the kiln the dried slurry which settles on the 10 sloping bottom from the combustion gases.

This application signed this 30th day of December A. D. 1927.

J OHAN S. FASTIN G. 

